1 Samuel 26:5-7

5Then David rose and came to the place where Saul had encamped. And David saw the place where Saul lay, with Abner the son of Ner, the commander of his army. Saul was lying within the encampment, while the army was encamped around him.

6Then David said to Ahimelech the Hittite, and to Joab's brother Abishai the son of Zeruiah, "Who will go down with me into the camp to Saul?" And Abishai said, "I will go down with you."

7So David and Abishai went to the army by night. And there lay Saul sleeping within the encampment, with his spear stuck in the ground at his head, and Abner and the army lay around him.